American Museum of Photography View great images from the history of photography, daguerreotypes to Ansel Adams. Features Americana, Civil War, Wild West, portraits, scenes, photojournalism, plus services for collectors and researchers. http://www.photographymuseum.com

Art and Medicine A resource for scholars interested in vintage medical photography and clinical portraits. Includes the complete translation and 52 plates of 'Klinische Abbildungen' by Heinrich Curschmann. http://www.artandmedicine.com/

Photographies Stereoscopiques 1850-1871 Online gallery of early stereoviews of Paris, Montmatre, Lyon, plus other areas of France and Egypt. Includes a brief history of photography, and links. http://photostereo.org/

Stanhopes.info Offering images, history, and information on Stanhopes, the miniature microphotographic lenses incorporated into many novelty collectables produced from the mid-19th century onwards. http://www.stanhopes.info/

The Daguerreian Society Dedicated to the history, science, and art of the daguerreotype. This site features galleries, extensive resources, and information. http://www.daguerre.org

The Library of Congress Extensive online exhibitions of historic photographs and documents. Includes the American Memory Historical Collections, a display of American history in words, sound, and pictures. http://www.loc.gov/